Stop-watch



(No Model.)

A. '0. JENNINGS.

STOP WATCH.

No. 352,326. Patented Nov. 9, 1886.

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UNITED STATES ARTHUR 0. JENNINGS, OF SQUTHPORT, CONNECTICUT.

PATENT OFFICE.

STOP-WATCH.

SPECIFICATION forming part of Letters Patent No. 352,326, dated November 9, 1886.

(No model.)

T0 all whom it may concern:

Be it known that I, ARTHUR 0. JENNINGS, a resident of Southport, in the county of Fairfield and State of Connecticut, have invented an Improved Stop-\Vatch, of which the following is a full, clear, and exact description, reference being made to the accompanying drawings, in which Figure 1 represents a face view, partly in section, of my improved stop-watch. Fig. 2 is a face View, partly in section, of part of the same. Fig. 3 isaside view of the stopping arrangement.

This invention relates to anew arrangement or combination of parts for promptly arresting the movement of a watch or the like, and for setting it into operation again when desired.

In the stop-watch devices that are now in use the arresting of the movement seems to have been the sole aim of the constrncters, they being apparently satisfied that the spring in the watch will at all times suffice to set the parts in motion again as soon as they may be relieved from the stop mechanism; but I find that in many watches, especially the less expensive kinds, it does not always follow that the watch will instantly resume its action upon being relieved from the arresting device, and

I therefore have so constructed the arresting device in my invention that it will constitute a starting device while being withdrawn from the works which it had previously arrested.

To this end my invention consists in combining a certain springslide with the arborof the balance-wheel, the parts being arranged so that when the springslide is moved in one direction it will be crowded tightly against the arbor of said balancewheel, so as to prevent the latter from moving, thereby stopping the watch, but when said spring-slide is afterward moved in the opposite direction it will, by peripheral contact with the said arbor, re-

volve the same part way before leaving contact with it, and thereby start the works in motion while releasing them.

In the drawings, the letter a represents the arbor of the balance-wheel!) of a watch, a.

d is a sliding rod moving in suitable guides, c, and carrying at its inner end an elastic or spring arm,f. This arm, when the parts are in the position shown in Fig. 1, is not in contact with the arbor a, but is near said arbor. \Vhen afterward the slide at is moved into the position shown in Fig. 2, its spring-arm f is pressed tightly against the arbor a of the balance-wheel, and thereby prevents said balance-wheel from further oscillation. Thus the spring slide df constitutes afriction-brake for while continue this frictional contact and serve to impart rotary motion or a partial rotation to the arbor a. Thus the works are started by positive movement, and any failure of the springs of the watch to start it after the stop has been withdrawn will be avoided.

I claim In combination with the arbora of the bal ance-wheel of a watch or analogous structure, the slide (1, carrying the elastic arm f, all adapted to bring said elastic arm in contact with said arbor at right angles with the axis thereof, and to move said arbor by, moving said slide, as specified. p

. ARTHUR 0. JENNINGS. Witnesses:

GEO. GOODYEAR, CHARLES G. M. THOMAS. 

